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Hybrid Bond Graph (HBG) is a bond graph-based modeling approach which provides an effective tool not only for dynamic modeling but also for fault detection and isolation (FDI) of switching systems. Efficient algorithms exist for fault detection and isolation based on functional redundancy. In a qualitative approach, this redundancy can be captured by a temporal causal graph (TCG), a directed graph...
This paper presents a sum of squares (SOS) approach to stability analysis of polynomial fuzzy systems with time-delay. Based on a novel polynomial Lyapunov-Krasovskii Functional, stability conditions are presented in terms of sum of squares in order to reduce the conservatism. The proposed SOS-based framework is more innovative and effective than the existing linear matrix inequality (LMI). The SOS...
This paper presents the synthesis of an adaptive observer which is used for the improvement of the Direct Torque Control (DTC) of induction motor drives. The observer detects the stator flux components in the two-phase stationary reference frame, the rotor speed and the stator resistance by the measure of the stator terminal voltages and currents. The observer is adapted using a simple algorithm which...
In this work, we consider the approximation of the model predictive controllers using a fuzzy Takagi Sugeno system and invoking its universal approximating property. The first step of the procedure is to generate the data for the approximation. This is performed in simulation off line by applying the MBPC to the system and recording the MBPC controller values for each sampling instant. The MBPC optimisation...
In this paper, we present the effect of the bank of capacity linked to stator windings, which used for the excitation of the generator to regulate the amplitude of produced voltage and frequency. The machine that we study is the Double Fed Induction Generator (DFIG). The main object is to control voltage amplitude and the frequency by simple access to the produced power. Note that this generator is...
In this paper the numerical investigation of the Sil-xGex/Si heterostructure solar cell is proposed. The proposed investigation is based on the study of the immunity of the Sil-xGex/Si heterostructure against the defects degradation effect at nanoscale level (thin films). The numerical analysis takes into consideration the impact of the interface defects on the solar cell behavior. In addition, a...
As the new generation standard of video coding, the High Efficiency Video Coding (HEVC) is intended to provide significantly better coding efficiency than all existing video coding standards. One of his improvements is the encoding process of the structure block. It was established that this process requires high computing power because it is performed using all the possible depth levels and prediction...
In this paper, a linear quadratic optimal control problem for linear descriptor systems is investigated. The optimal control is synthesized as derivative state feedback which guarantees that the closed loop system is stable and that minimizes quadratic criteria expressed a performance level. The steady state derivative feedback optimal gain can be computed by the use of the algebraic Riccati equations...
The inverted cart-pendulum provides interesting examples of nonlinear non-minimum phase systems. In this paper, as a matter of fact, a new approach to the output control for the inverted cart-pendulum is introduced. First, the inverted cart pendulum model is approximated by another singular perturbed system: the boundary-layer subsystem and the reduced subsystem. For the boundary-layer subsystem,...
To preserve the environment, a number of industrial countries is established legislative laws that encourage the development of the diversity of activities and the definitions given in this type of logistics, its design and its management are very complicated. We have demonstrated the efficacy of neural network tried using the programming language level MATLAB; generate a database containing all the...
This paper presents a series of labs in where the performance of practical WLAN technology is evaluated by using PCATTCP software. The experiments can be summarized as follows: Measurement of the throughput as a function of the number of users and network configuration, offered load (sharing efficiency/ fairness). Comparison between the throughput of TCP protocol, and the throughput of UDP Protocol...
From years ago, encryption became a necessity to transmit data securely. Like message written, fixed images or movies should be encrypted also while transmitted over a public channel. Currently, the literature is pointed to selective encryption for those types of data against attacks. That's to say, the encryption module is inserted into the chain of video compression to reduce the computational time,...
This work was done in Tunisian Chemical Group (TCG) factory Skhira producing phosphoric acid. It involves studying the filtration of slurry of phosphoric acid manufacture in second stage. This study will focus on the physical modeling of filtration phase and the setpoint is optimization under constraints which takes into account the different functional requirements of the system. The optimized parameters...
In this paper, optimal control problems for switched discrete systems are studied and compared to the same optimal problem for a continuous system; in particular we focus on problems in which a prespecified sequence of active subsystems is given and propose a metaheuristic approach to find the optimal switching instants. This approach is based on Particle swarm Algorithm. The objective is to minimize...
A facial expression is one of the non-verbal information that plays an important role in understanding face-to-face communications. Therefore, facial expressions are the most important means of detecting emotions and behavioral analysis science. Although human being have ability recognize the face practically without any effort, but facial recognition system is still challenging by machine. This paper...
This paper describes efficient hardware architecture for the deblocking filter used in H.264/AVC baseline profile video coding standard. The deblocking filter is a computationally and data intensive tool leading to an increased execution time of both encoding and decoding processes. In fact, we propose a novel edge filter ordering which needs 64 clock cycles to filter a Macroblock (MB). A specified...
This paper is focused on the design and the implementation of a hybrid PV-wind power system with batteries. It aims to emulate the behavior of a hybrid power system in order to face load consumption variations. Final system includes relevant contributions such as quality of emulator (a large number of parameters are considered); capacity to study various impacts simultaneously, a fast dynamic and...
The employment of power converters to integrate renewable energy sources to the utility network is well known. In such context, there is an increasing interest in developing an appropriate control methodology to ensure perfect compliance of photovoltaic systems with the utility by obtaining a current with low harmonic distortion. In this paper a current control strategy for grid connected photovoltaic...
The objective of this work is to define the fractional order PID and the approximation of the integral and derivation of fractional order to render the system from irrational to rational. The parameters of PID are determined by three methods. These fractional controllers have two parameters more than the conventional PID controller, two more specifications can be met, improving the performance of...
This paper presents a water pumping system using a self excited induction generator driven by wind turbine and supplying an induction motor which is coupled to a centrifugal pump. In the first part a MPPT algorithm to extract the maximum power rated by a wind turbine is presented, which uses a frequency controller to give an optimal rotor speed. The simulation testing results were presented and compared...
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